2

Depends:
Literature review states few minutes to 2 hours. Purposeful exposure or inhalation of butane is very dangerous and can lead to sudden death. There is a very thin margin between purposeful exposure to produce a drug high and sudden death. DO NOT expose yourself to purposeful inhalation. Any symptoms such as chest pain, palpitations, difficulty breathing....seek care ASAP in ER
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4

Won't kill you:
Butane smells nasty but it won't kill you and a whiff won't endanger your health. Neither will any of the other hydrocarbons used for burning. The really dangerous chemicals are kept under pretty good control. If you use the lighter for smoking tobacco, perhaps this would be a great time to think about getting help with quitting. You're in your prime & deserve to give yourself the best.
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5

Drug screening:
Single use Marijuana may be found in blood for 12 to 24 hours. Regular Use Marijuana may be found in blood for 2 to 7 days. Single use Marijuana might be detected in urine for 1 to 7 days (or more) and regular marijuana use can be detected in urine for 7 to 100 days (longer periods have been reported though).
In “Pharmacokinetics of Cannabinoids” by McGilveray IJ it is stated “Hair tests are more
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8

Wikipedia: hash oil:
is where I got the info to answer your Q.The process uses LIQUID butane to dissolved chemicals in pot.Butane boils away at room temp very quickly,leaving crystals.These crystals get dissolved in the oil,which U smoked.Butane BOILS at below freezing.If there was any butane in the oil it would have exploded when you lit it.The question is, what other chemicals were concentrated for U to smoke?
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10

Should be fine:
The amount of inhaled butane you would have received from the spillage that would have occurred in the scenario you describe would not be a danger to your health. You should be ok.
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